Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 10 Nov 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

9(6)

40(40)

46(-)

24(10)

0.3(3)

22(62)

South

13(8)

33(33)

39(-)

33(14)

0.5(5)

23(64)

East

11(7)

31(31)

28(-)

37(16)

0.5(5)

24(65)

West

22(14)

39(39)

55(-)

38(16)

0.5(5)

27(68)

Central

15(10)

31(31)

55(-)

48(20)

0.6(6)

21(61)

1-hr PM2.5 (µg/m3)b Readings on 10 Nov 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

17

25

20

22

19

29

28

31

25

29

35

25

South

20

17

23

41

22

30

25

28

39

40

47

8

East

27

26

29

31

34

39

35

36

50

42

33

6

West

23

19

27

31

31

32

20

34

25

26

35

28

Central

16

22

26

29

23

28

26

32

32

31

38

7

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

12

11

11

16

22

18

23

26

25

17

16

-

South

17

28

30

34

36

29

6

5

4

7

7

-

East

15

14

25

23

21

26

16

15

9

7

10

-

West

40

26

26

29

37

31

23

22

18

17

16

-

Central

10

9

21

26

21

29

19

14

15

4

10

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
10 Nov 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

59

61

63

67

68

71

69

71

72

75

77

70

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

64

57

59

62

66

67

64

60

55

53

51

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.